Many of the reinforcement learning techniques require data sets in the billions to make much sense of it all. This is likely the reason why the AI had to play a

Many of the reinforcement learning techniques require data sets in the billions to make much sense of it all. This is likely the reason why the AI had to play against itself so much, because there simply wasn't enough data in general, even including all recorded games. So Lee's games are sort of a drop in a bucket as far the performance of the AI goes.